class KERLException(Exception): pass
class UnexpectedResult(KERLException): pass

class ComponentNotFound(KERLException): pass
class ComponentDisabled(ComponentNotFound): pass
    
class ComponentTypeException(KERLException): pass
class InvalidKerlExpression(KERLException): pass
class InvalidKerlOperator(InvalidKerlExpression): pass
class InvalidKerlReference(InvalidKerlExpression): pass    



